Erasing-shield for type-writing machines.



R. CAMPBELL.

ERASING SHIELD FOR TYPE WRITING MACHINES.

APPLICATION FILED JAN. 10.1918.

Patented Nov. 19, 1918.

2 SHEETS-SHEET 1- R. CAMPBELL.

ERASING SHI ELD FOR TYPE WRIHNG MACHINES.

APPLICATION FILED JAN. \0. I918.

1 285,032.. Patented Nov. 19, 1918.

2 SHEETSSHEET 2.

M attorney RUTH CAMPBELL, OF YAZOO CITY, MISSISSIPPI, ASSIGNOR T0 UNDERWOOD TYPE- WRI'IER COMPANY, OF NEW YORK, N. Y., A. CORPORATION OF DELAWARE.

Specification of Letters Patent.

Patented Nov. 1a, 1918.

Application filed January 10, 1918. Serial No. 211,162.

To all whom it may concern:

Be it known that I, RUTH CAMPBELL, a citizen of the United States, residing at Yazoo City, in the county of Yazoo and State of Mississippi, have invented certain. new and useful Improvements in Erasing- Shields for Type-Writing Machines, of which the following is a specification.

This invention relates to typewriters, and has for its object to provide a simple and convenient erasing shield therefor which may be quickly adjusted to the platen roll and inserted between the sheets of paper and the carbons whereby erasures may be neatly made on each sheet without smearing or blurring the other copies.

Accordin to my invention, a shield, formed of s eet metal or other suitable material, is provided on both ends with extensions or supports adapted to rest on the ends of the carriage, and by means of which it is properl supported on the carriage. The shield is preferably so curved that when it is in operative position on the carriage the lower edge of the shield will extend down to the printing line of the ordinary visible machine. The end supports are provided with chains or the like which are secured to some portion of the machine, preferably the tabulator stop bar, and by means of which the shield may be swung from operative position on the carriage to its normally inoperative position at the back of the machine where it is out of the way of the operator and will not interfere with the proper operation of the machine.

Referring to the accompanying drawings Figure 1 illustrates diagrammatically a perspective view of a typewriting machine provided with my attachment.

Fig. 2 represents diagrammatically a rear elevation of a machine provided with my device showing how the erasing shield is norma y disposed out of the way of the opera tor.

Fig. 3 represents a perspective view of the shield detached from the machine.

Fig. 4 illustrates diagrammatically a cross section through the carriage of a typewriter, showing how the shield is inserted between the sheets of aper.

In the drawings, 5 represents a typewriter of any standard construction, but preferably such a well known machine as the Underwood or the Royal, as these machines are constructed with carriages to which my device is most readily applicable. The typewriter 5 is provided with a carriage 6, having end portions 7-7 and a roller 8. The approximate printing point is indicated at 9.

My invention comprises a plate 10 of sheet metal or other suitable material preferably of approximately the same length as the platen roll 8 and is of a suitable thickness along the upper edge to give it the necessary rigidity, but it tapers gradually toward the lower edge Where it is comparatively thin in order that that portion of the plate may fit closely to the roll, thereby preventing the paper from becoming bulged or wrinkled when the plate is in position. The plate is provided on both ends with projecting supports 1111 adapted to rest on the ends 7-7 of the carriage 6 to support the shield in operative position. While these supports may be formed in any desired way, I prefer to provide the plate 10 with a cross bar 12, the ends of which form the supports 11-11. These supports ma be recessed or provided with shoulders, as indicated in the drawings, whereby the shield is made to set more firmly on the ends 7-7 of the carriage, or on some other suitable part thereof. Secured to the ends 11ll by any desired means, 13, are small chains or similar flexible connectors 14 which are secured to the ends of the tabulator stop bar 15 of the typewriter, or to any other suitable part of the machine, but

preferably to some stationary art thereof.

These chains are preferably of Just sufficient length to permit of the shield being swung from operative position on the carriage up over the carriage to the back of the machine where it is normally permitted to han as shown in Fig. 2. In this position it ad s to the neat appearance of the machine, hidmg part of the typewriter mechanism which ordinaril is visible from the rear of the machine.

I prefer to so curve the erasing plate 10 that when the shield is placed in posltion on the carriage the lower end of the plate extends down to approximately the printing point 9 of the typewriter, as indicated in Fig. 4, whereby erasures may be made without turning the roller 8 to feed the paper any appreciable distance above the printing line and close to the bottoms of the sheets.

In operation, when it is desired to make an erasure, the operator need only reach to projecting endwise from the the rear of the machine. and grasp one or both of the end portions 11, swing the shield up over the carriage and rest the ends 11 on a suitable portion or the carriage as on the ends 7- thereof, at the same time inserting the plate 10 between the first sheet or paper a and the carbon sheet 6, as indicated for instance in Fig. 4 of the drawings. An erasure having been made on the top sheet the operator may then ,withdaw the shield and insert it back of the second sheet 0. in a similar manner the remaining copies may be corrected, and the shield returned to its normal position at the back of the machine.

it will be seen from the foregoing that while I have provided an erasing shield which may he quickly brought into operative position it is normally so disposed away from the carriage as not to render the use of the carriage more difficult or awkward, and it will not interfere with the proper movement of the various parts of the typewriter,

1 claim as my invention:

1. An erasing shield for typewriting machines, comprising a curved plate, and arms projecting endwise from the ends of the plate having recessed ortions adapted to engage the side bars or the paper carriage.

2. An erasing shield for typewriting machines, comprising a curved plate, arms projecting endwise from the ends of the plate having recessed portions adapted to engage the side bars of the carriage, and flexible connectors attached to said arms provided with means for attachment to the typewriter frame.

3. An erasing shield for typewritiiig machines, comprising curved pla and a--r plate having recessed portions adapted to engage the side bars of the paper carriage and formed with shoulders to engage the inner sides of the said bars to prevent sidewise movement of the shield when supported by said side bars.

4. The combination with the typewriter frame, the paper carriage and the platen, of an erasing shield comprising a curved plate adapt-ed to rest at its lower end on the platen, and laterally projecting arms adapt ed to rest on the side bars of the carriage.

5. in combination with a typewriter having a frame, a printing mechanism and a carriage provided with a platen cooperating with said printing mechanism, of an erasing shield adapted to rest on said carriage when in operative position comprising a plate adapted to extend to approximately the printing point on said platen when the shield is in operative position, and connectors connected with said plate and secured to the typewriter frame for suspending said shield from said frame when the shield is in inoperative position.

6. The combination with a typewriter i *ame, the paper carriage and the platen of an erasing shield, comprising a curved plate adapted to rest at its lower end on the platen, laterally projecting arms adapted to rest on the side bars of the carriage, and flexible connectors carried by said arms for attachinr the shield to the typewriter frame.

in testimony whereof, E have hereunto subscribed my name, 

